Hi
Yes you can take sea COD oil tablets or any multivitamin which you provide you
vitamin minerals.
But I want to mention you can a cover vitamins ans minerals from the diet itself.
Vitamin & minerals are the micronutrients that means they are required in very small quantity by the body , so they can be covered with the diet itself...
So I would recommend you to any meet any dietician or nutritionist to know how you can include the vitamins minerals food sources in your diet.
If you are vegetarian then sea COD
liver oil will be good for you as you not be eating fish or non vegetarian diet.
Disclaimer - Tip may vary if you suffering from any medical issues
Meet a Dietician/Nutritionist for personalized diet plan
Eat healthy!! Stay Healthy !! As it's the body in which you have to live in!